The air expansion shaft is a special winding and unwinding shaft, that is, the shaft whose surface (key bar) can protrude after high-pressure inflation, and the shaft whose surface (key bar) retracts rapidly after deflation. Its name is diversified. It is also called air pressure shaft, expansion shaft, expansion shaft, expansion roll, inflation roll, pressure shaft, expansion roll, etc. Although there are many names, the working principle is the same The use of air expansion shaft and air expansion sleeve is very convenient and fast. You only need to provide your own air source. The air pressure is controlled within the range of 6-8kg/cm2. If you need to lock external parts (such as round paper tubes), you can complete as long as the air gun inflates against the dehumidifier air nozzle on the air expansion shaft. The key bar will protrude against the external parts (such as round paper tubes). When you need to loosen the paper unloading, press the sliding air core on the air nozzle to deflate, The key bar will return to its original appearance, and the external parts (such as round paper tubes) can be taken out of the professional production inflatable shaft for maintenance.